Toz Metalurji̇si̇ Yöntemi̇ İle Alümi̇nyum Köpük Üreti̇mi̇ Procuction of Al Foams by Powder Metallurgy Route

In this study pure Al and pre-alloyed Al alloy powders (Alumix 231Al-Cu %2.5-Mg %0.5–Si %14) with or without reinforcing elements were used to produce classical Al foam or spherical Al foam with various production parameters by using powder metallurgy route and the results obtained have been discussed. Al2O3 and SiC particles were used as reinforcing elements and TiH2 powders were used as foaming agent. Al powders, reinforcing element and foaming agent were mixed in a three dimensional turbula for 30 min. Mixed powders were compacted, sintered and deformed and then foamed at various foaming temperatures. Effect of reinforcing elements, foaming temperature and foaming agent amount on the foaming behavior, pore structure, pore distribution, linear expansion coefficient, density and wall thickness of the cell were investigated.